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x in (-oo:+oo)
x*((40-(3*x))/2)*(20-(2*x)) = 0
x*((40-3*x)/2)*(20-2*x) = 0
(x*(40-3*x)*(20-2*x))/2 = 0
( 20-2*x )
20-2*x = 0 // - 20
-2*x = -20 // : -2
x = -20/(-2)
x = 10
( 40-3*x )
40-3*x = 0 // - 40
-3*x = -40 // : -3
x = -40/(-3)
x = 40/3
( x )
x = 0
x in { 10, 40/3, 0 }
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